Perf issue on external usb-c ssd drive

[Patrick Zwahlen]

Hi,

I'm using WinFSP+SecureFS since many years. Recently, I got a Samsung EVO T5 external usb-c drive. I also have an NVMe ssd drive in my Windows 11 laptop.

I can read and write to both my internal and external ssd at ~300MB/s

When creating a WinFSP+SecureFS volume on my internal drive, I don't see a real performance impact. I still get ~300MB/s

However, when creating a WinFSP+SecureFS volume on my external usb drive, read speed drops to ~10MB/s and write speed to ~3MB/s

Does any one have a clue what the issue might be ?

I'm only testing throughput so far, not random IO.

This happens with both WInFSP 2022.2u1 and 2023. as well as SecureFS 0.14.2 and 0.14.3

Regards. Patrick!

[Patrick Zwahlen]

Replying to myself. SecureFS author put me on the track of srite caching (https://github.com/netheril96/securefs/issues/170).

Disabling "quick removal" on this ssd-drive seems to restore performance. However, I need to add that dokany+cppcryptfs was perfectly able to write at ~220MB/s with the "quick removal" enabled on this drive.

Does that make any sense ?

Regards!